<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登陆页面</title>
    <link rel="stylesheet" href="css/conmmon.css">
    <link rel="stylesheet" href="css/login.css">
    <script src="js/jquery.min.js"></script>
    <style>
        input::-webkit-input-placeholder {
            color: #cccccc;
            font-size: 14px;
        }

        #canvas {
            vertical-align: middle;
            box-sizing: border-box;
            cursor: pointer;
        }
    </style>
</head>

<body>
    <!-- 导航栏 -->
    <div class="nav">
        <img src="img/log2.jpg" alt="">
        <a href="blog_list.html" class="title">博客系统主页</a>
        <!-- 用来占据中间位置 -->
        <span class="spacer"></span>
        <a href="myblog_list.html">主页</a>
        <a href="blog_add.html">写博客</a>
        <a href="reg.html">注册</a>
        <!-- <a href="#">注销</a> -->
    </div>
    <!-- 版心 -->
    <div class="login-container">
        <!-- 中间的登陆框 -->
        <div class="login-dialog">
            <h3>登陆</h3>
            <div class="row">
                <span>用户名</span>
                <input type="text" id="username">
            </div>
            <div class="row">
                <span>密码</span>
                <input type="password" id="password">
            </div>
            <div class="row">
                <span>
                    <canvas id="canvas" alt="" style="width: 100px;height: 42px"></canvas>
                </span>
                <input type="text" class="input-val" placeholder="请输入左侧验证码" v-model="yourCode">
                <!--<img th:src="@{/img/code.bmp}" alt=""/>-->
            </div>
            <div class="row" id="regAndlogin">
                <button onclick="location.href='reg.html'">注册</button>
                <button id="submit" onclick="mysub()">登录</button>
            </div>
            <div class="rowfind" id="findpassword">
                <button onclick="location.href='blog_forgetpsw.html'">找回密码</button>
            </div>
        </div>
    </div>
    <script>
        function mysub() {
            //1.非空校验
            var username = jQuery("#username");
            var password = jQuery("#password");
            if (username.val() == '') {
                alert("用户名不能为空");
                username.focus();
                return;
            }
            if (password.val() == "") {
                alert("密码不能为空");
                password.focus();
                return;
            }
            var val = $(".input-val").val().toLowerCase();
            var num = show_num.join("");
            if (val == '') {
                alert('请输入验证码！');
                return;
            } else if (val == num) {
                // draw(show_num);

            } else {
                alert('验证码错误！请重新输入！');
                $(".input-val").val('');
                return;
                // draw(show_num);
            }
            //2.ajax请求登录结果
            jQuery.ajax({
                type: "post",
                url: "/user/login",
                data: { "username": username.val(), "password": password.val() },
                success: function (result) {
                    if (result != "" && result.code == 200 && result.data != null) {
                        //登录成功
                        location.href = "/myblog_list.html"
                    } else {
                        alert("登陆失败！用户名或密码错误！")
                    }
                }
            })
        }
        var show_num = [];
        //图形验证码功能:
        $(function () {

            draw(show_num);

            $("#canvas").on('click', function () {
                draw(show_num);
            })

        })

        //生成并渲染出验证码图形
        function draw(show_num) {
            var canvas_width = $('#canvas').width();
            var canvas_height = $('#canvas').height();
            var canvas = document.getElementById("canvas");//获取到canvas的对象，演员
            var context = canvas.getContext("2d");//获取到canvas画图的环境，演员表演的舞台
            canvas.width = canvas_width;
            canvas.height = canvas_height;
            var sCode = "a,b,c,d,e,f,g,h,i,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0";
            var aCode = sCode.split(",");
            var aLength = aCode.length;//获取到数组的长度

            for (var i = 0; i < 4; i++) {  //这里的for循环可以控制验证码位数（如果想显示6位数，4改成6即可）
                var j = Math.floor(Math.random() * aLength);//获取到随机的索引值
                // var deg = Math.random() * 30 * Math.PI / 180;//产生0~30之间的随机弧度
                var deg = Math.random() - 0.5; //产生一个随机弧度
                var txt = aCode[j];//得到随机的一个内容
                show_num[i] = txt.toLowerCase();
                var x = 10 + i * 20;//文字在canvas上的x坐标
                var y = 20 + Math.random() * 8;//文字在canvas上的y坐标
                context.font = "bold 23px 微软雅黑";

                context.translate(x, y);
                context.rotate(deg);

                context.fillStyle = randomColor();
                context.fillText(txt, 0, 0);

                context.rotate(-deg);
                context.translate(-x, -y);
            }
            for (var i = 0; i <= 5; i++) { //验证码上显示线条
                context.strokeStyle = randomColor();
                context.beginPath();
                context.moveTo(Math.random() * canvas_width, Math.random() * canvas_height);
                context.lineTo(Math.random() * canvas_width, Math.random() * canvas_height);
                context.stroke();
            }
            for (var i = 0; i <= 30; i++) { //验证码上显示小点
                context.strokeStyle = randomColor();
                context.beginPath();
                var x = Math.random() * canvas_width;
                var y = Math.random() * canvas_height;
                context.moveTo(x, y);
                context.lineTo(x + 1, y + 1);
                context.stroke();
            }
        }

        //得到随机的颜色值
        function randomColor() {
            var r = Math.floor(Math.random() * 256);
            var g = Math.floor(Math.random() * 256);
            var b = Math.floor(Math.random() * 256);
            return "rgb(" + r + "," + g + "," + b + ")";
        }

    </script>
</body>

</html>